Newcastle United could be busy this summer. With this season having been something of a reality check following all the success of last year, a big summer transfer window is being predicted at Newcastle. Though the extent of their rebuild could be impacted by lingering FFP issues, some previously key players for the club could well depart. Indeed, Callum Wilson has been tipped for an exit from St James’ Park. The striker, hailed as “unbelievable” by Eddie Howe, was linked with a shock move to AC Milan and Atletico Madrid during the January transfer window. Clearly, that never came to fruition …